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Effect of Bilberon-25 and naloxone on substance P-induced pruritus Bilberon-25 was orally administered for 5 days, and after final administration substance P was injected intradermally. Naloxone was administered once subcutaneously 15 minutes before treatment with substance P. Scratching bouts were counted for 30 minutes using Micro Act. Values represent the mean ± Standard error of mean of 6 mice
